Engine-lathe



(No Model.)

H C EM., ML H B wm .N ...SB .Tu @W No. 557,031. v1 ange1um1 Mar.24,1896.

(No Model.)

W. LQSCHBLLBNBAGH.

ENGINE LATHB.

Patented Mar ANDREW RGRMMM. PNOTOLITMD. WASHINGTUN. D C.

UNITED STATES PATENT OFFICE.

WILLIAM L. scIIELLENBAcII, on LIBERTY, INDIANA.

ENGINE-LATHE.

SPECIFICATION forming part of Letters Patent No. 557,031, dated March24, 1896.

Application filed November 15,1895. Serial No. 569,089. (No model.)

To all whom it may con/067%:

Be it known that I, WILLIAM L. SCHEL- LENBACH, residing at Liberty, inthe county of Union and State of Indiana, have invented certain new anduseful Improvements in Engine-Lathes, of which the following is aspeciiication.

My invention relates to that class of lathes ordinarily termedengine-lathes.

One of the objects of my invention is to provide ready means forchanging the speed of the feeding-gear moving the tool-carriage.

Another object of'my invention is to provide Inechanism which willchange the speed and set it to any desired rate for screw-cutting, sothat any desired pitch of thread may be readily obtained by setting thespeed, the adj listing-screws having indexes so that the parts canbebrought accurately and quickly to the proper position.

Another object of my invention is to provide an increased range of speedadjustment.

Another object of my invention is to provide two sets of feedingmechanism-to wit, the screw-feed and the rack-and-pinion feed, withready means for throwing the same out of or into gear.

The various features of my invention will be more fully set forth in thedescription of the accompanying drawings, making a part of thisspecification, in which- Figure 1 is a front elevation of my improvedlathe in position for use. Fig. 2 isaleft-hand elevation of Fig. 1. Fig.3 is a section on line fr, Fig. 4. Fig. 4 is a section on line y y, Fig.5. Fig. 5 is a section on line o t', Fig. 4. Fig. 6 is a section on linew w, Fig. 4. Fig. 7 is a detailed view of the adjusting devices. Fig. 8is a sectional plan view of the outside change-gear and housing. Fig. 9is an end elevation of Fig. 8.

A represents the bed of the lathe; A, the tail-stock; B, the head-stock.

B represents the main driving-pulley.

.B2 represents the spur-gear, and B3 a transmitter connected so that itmay be thrown out of and in mesh with gear B2. Gear B8 meshes with anddrives gear C on the shaft Q, which transmits motion to the severalfeeding-gears of the tool-carriage D. A

a d represent cone-pulleys, also for changing the speed, if desired, ofshaft Q.

lV hen it is desired to feed the tool-carriage by a screw-feed, lprovide the following devices: E represents a screw-threaded rod rigidlyconnected at each end to one side of the lathe-bed. The base portion ofthe tool-carriage D is preferably a hollow box, which spans thescrew-shaf t, and inside thereof is mounted a series of cone-gears F,which are attached to a sleeve h by aspline. Said sleeve is jour naledin the boxes b'. To the inner end of said sleeve is attached thescrew-feed, which consists of wedge-shaped jaws G. These jaws areinserted in slots cut into the sleeve, as shown in Fig'G, which sleeveis enlarged on the inner end, as shown in Fig. 4. These jaws are splinedto the collar l-Iby tapered splines c. The segmentalfaces of these jawsare threaded to engage with the screw-rod E and drive the carriage alongthe ways by motion imparted through gears F. Collar I-I is operated by abell-crank lever I, engaging split ring l, so as to move the collar I-llongitudinally with shaft E and remove the Wedgejaws G and disconnecttheir threads from engagement with screw-rod E. The driving of gears Fwhen the screw-wedges are in engagement with the screw-rod propels thecarriage D along its way d uponA the lathe-bed.

In order that the speed of the screw-jaws may be readily increased ordecreased, I pro vide the following 'transmitting Inechanismand'shifting mechanism: Shaft Q transmits motion by means of gear Umounted upon a sleeve c splined to shaft Q. Said sleeve is adjustablelaterally on shaft Q'by means of the outer sleeve J, Which is sleevedupon the sleeve c. K represents a set-screw, the inner end of which tapsthe sleeve J to hold it in a fixed position. When the set-screw isreleased the sleeve J may be moved laterally, carrying with it thesleeve e and gear U. Gear U transmits motion to either one of the gears1 2 3 4, as desired. These gears are mounted loosely upon shaft 5, gears1 and 2 are splined together and gears 3 and 4 are splined together, andthey are held in adjustable engagement with the gear U by means ofsetscrew 6, which taps into the housing 7, said set-screw 6 sliding in aslot 8 in upright 9 on the carriage D. The housing 7 is slid in or outto bring either one of the gears 1 2 3 4 j into mesh with thetransmitter U, as desired.

ICO

These gears 1 2 3 4c transmit motion to either of gears m n in housing7, as shown by the transverse section Fig. S, to shaft t. Shaft tcarries the transmitting-gear L splined on shaft t. o represents ashiftable intermediate gear journaled ,0n the oscillating arm N uponsleeve Z. Said sleeve is likewise connected to the main shiftable gear Lby pins or keys entering an annular groove in the hub of the gear L, sothat said gear is free to revolve and can be shifted laterally on theshaft t by means of the rack g and pinion h on the shaft f to adjustsaid gear laterally on the shaft t and shift the intermediate gear ointo engagement with any one of the cone-gears F. Said shaft f issecured in position by means of knurl 10 and spring 11. In order adjustthe said gears L and 0 laterally and to bring gear o into mesh with thesmaller ones of the conegears the shaft j' has got to be elevated at theouter end so that gear o will mesh with the smaller cone-gear. Now asthe change from the larger to the next smaller makes a change increasingthe speed of the feed and thereby increasing the pitch of the threads,notches are provided on the segment 12 for each step of increase, therebeing one notch for each of the smaller cone-gears F. lIenee theoperator can readily tell by this index with which of the cone-gears tomake his adjustment and the adjustment when made is readily noted. Anindex maybe made on the hase 13 of the knurl so as to indicate thenumber of turns of shaft f and gear h which are required to show thedistance that gear o is to be moved to bring it into position to engagethe proper member of the cone-gear F. 1l represents a lock-pin whichholds the knurl in the adjusted position on the lever l the shaft fbeing journaled in the said lever N. It will be observed that the spring11 rests in the recess of the knurl and allows the knurl to be pulledout at any time to release the engagement of the pin 11. It will be thusseen that I employ two sets of change feedgears, one of them beingintermediate between the cone-gear F and the main drivinggear C-to wit,the gears 1 2 3 4 and U. rlhus there is an increased range of adjustmentand variation of speed over what could be obtained by the cone-gear Fand the shiftable gear o, and as each set of change-gears has anindex-plate they can be so numbered as to obtain all the ranges ofadjustment ordinarily required in an engine-lathe.

I have shown eight members of the conegear and I have shown four changesof speed for the intermediate change-gear, each four of which multiplythe change of speed for each of the cone members, thus making thirtytwochanges of adjustment in all, outside of the changes which may beobtained in the main driving-gear.

It is sometimes desired to employthe rackand-pinion feed for thetool-carriage. In Fig. 4; I show the construction and arrangement ofthese parts. 1G 17 represent bevel-gears mounted upon sleeve 18, whichsleeve is splined upon shaft Q. 19 represents a bevelgear journaledopposite and adapted to engage with either one of the bevels 1G or 17.2O represents a spur-gear engaging and driving gear 21, which in turntransmits motion to gear 22. Spur-gear 23 on the hub of gear 22transmits motion 'to gear 24. 25 represents a spur-gear upon the axis ofgear 211, which transmits motion to the apron from rack 26, which isformed on the lathe-bed. As the gear 25 is keyed to a shaft whichjournals in the tool-carriage D, a revolution of said gear propels thecarriage on its ways across the bed of the lathe, according to thedirection in which the same is revolved. In order that this gear may benormally held out of engagement, I provide a lock -lever 27, whichcarries a crank-arm 28 engaging with the gearshifter 29, one arm ofwhich yokes around the hub 30 of gear 1G and engages with the groove 31,so that as said shifter 29 is moved backward and forward the gears 1G 17may be brought into or out of mesh with gear 19, as desired. 33represents springs which normally hold the shifter 29 in the middleposition when both gears 1G and 17 are out of mesh, and it is theposition they occupy when the screw-feed is employed to move thetoolearriage. fhen it is desired to use the rackfeed, the screw-feed isthrown out and the setting-lever 27 is moved to bring into engagementone of the bevel-gears 16 or 17, as desired, when the rack-teeth operatethe toolcarriage. In order to automatically trip and throw the rack-gearout, I provide a stop 31 on the lathe, against which the setting-leverstrikes when it is movedinto the central position. This stop 34E may beadjusted along the lathe to any desired point.

It is sometimes desired to feed the tool-post automatically across thetool-carriage. To accomplish this I provide a gear 36 meshing with gear23 and transmitting motion to gear 37 on the tool-shaft 3S, whichtool-shaft is threaded in the tool-head 39 and moves it in thedovetailed ways 40 on the face of the toolcarriage D.

If desired, the gear 36 maybe adapted to be shifted out of engagementwith the gear 37, so that the tool head or post 39 can be movedlaterally by rotating the tool-shaft 3S through the medium of the handle4.1, but as this does not constitute any part of my present invention, Ido not deem it necessary to illustrate the same, especially in view ofthe fact that shiftable gears are well known.

I claim- 1. In a lathe the feeding devices for the tool-carriageconsisting substantially of a screw-rod attached to the lathe, a seriesof cone-gears, a nut attached thereto and engaging with the screw-rod, ashiftable gear and a transmitter mounted upon a laterally and rotaryadjusting-arm, substantially as specified.

2. In a lathe employing a stationary screw- IOO ITO

`rod, cone-gears and a nut connected thereto,

a shiftable gear and a transmitter mounted upon a laterally and rotaryadjusting-arm and means for locking the parts to their adj ustedposition, substantially as specified.

3. In a lathe in combination With a toolcarriage a screw-rod secured tothe lathe, a series of cone-gears loosely journaled upon said screw-rod,and the Wedge-jaws G, connected to the journals of the cone-gear andmeans for opening` and closing said jaws, substantially as specified.

4. In a lathe in combination with thetoolcarriage D the screw-rod E,cone-gears F, Wedge-jaws G, and the shiftable gear o mounted upon theadjustable arm N which carries the transmitter L, and provided With theknurl and index adjustment, substantially as specified.

5. In a lathe a feed-screw rod attached to the lathe in combination witha tool-carriage, a series of cone-gears, journaled upon the screw rod, ashiftable intermediate gear mounted upon an arm having atransmittinggear as its center and secured to a traveling sleeve mountedupon the transmitting-shaft, and devices for adjusting said sleevelongitudinally and mechanism for adjusting the shiftable intermediategear radially on said shaft, substantially as specified.

6. In a lathe employing a screw-rod for operating a travelingtool-carriage, the feedshaft Q, in combination with a train ofchangeable gears mounted upon the tool-carriage and adapted to beadjusted longitudinally and radially, and the nuts 6 and K, for securingthe parts in their adjusted substantially as specified.

7. In a lathe employing a stationary screwrod secured thereto, andtraveling tool-carriage having journal-supports for a longitudinalfeeding-shaft Q, the combination of a train of changeable gear fortransmitting motion to the cone-gear, and a second set ofinterchangeable gears interposed between the gear of said shaft Q andthe cone-gear F, substantially as described.

8. In a lathe having a traveling tool-carriage, the combination with thecone-gears F, of the shafts and Q journaled on the carriage and providedrespectively With the transmittergear U, and the series of intermediateshiftable gears, the shaft t having the gears m and fn. co-operatingWith said shiftable gears, the shiftable gear o mounted on the shaft tand engaging any of the conegears, and means for shifting the shiftablegear, substantially as described.

In testimony whereof I have hereunto set my hand.

WILLIAM L. SCHELLENBACH.

Witnesses:

C. W. MILES, OLIVER B. T. KAISER.

position,

